Dear Matthias,
Thank you very much for your help and quick reply! I followed instruction, actually I had to use sudo to delete jedi-0.18.1. When I run "make build", I ran into another problem below. I attempted "brew install r" then "make build" again, still, the same error message occur. Thanks!
[r-none] Error: r is a dummy package and
[r-none] cannot be installed using the Sage distribution.
make[4]: *** [r-SAGE_LOCAL-no-deps] Error 1
make[3]: *** [/Users/jianpingpan/sage/local/var/lib/sage/installed/r-none] Error 2
make[2]: *** [all-build] Error 2
real 0m0.532s
user 0m0.344s
sys 0m0.161s
***************************************************************
Error building Sage.
The following package(s) may have failed to build (not necessarily
during this run of 'make all-build'):
* package: r-none
last build time: Jun 3 16:47
log file: /Users/jianpingpan/sage/logs/pkgs/r-none.log
Thanks,
Jianping